form {
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    position: absolute;
    background-color: white;
}

body {
    background-image: url(login-cover.jpg);
    background-blend-mode: overlay;
    background-color: rgba(0,0,0, 0.5);
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}